add.isolates {sna}

Add Isolates to a Graph

Description

Adds n isolates to the graph (or graphs) in dat.

Usage

add.isolates(dat, n, return.as.edgelist = FALSE)

Arguments

dat

one or more input graphs.

n

the number of isolates to add.

return.as.edgelist

logical; should the input graph be returned as an edgelist (rather than an adjacency matrix)?

Details

If dat contains more than one graph, the n isolates are added to each member of dat.

Value

The updated graph(s).

Note

Isolate addition is particularly useful when computing structural distances between graphs of different orders; see the above reference for details.

Author(s)

Carter T. Butts [e-mail]

References

Butts, C.T., and Carley, K.M. (2001). “Multivariate Methods for Inter-Structural Analysis.” CASOS Working Paper, Carnegie Mellon University.

See Also

isolates

Examples

g<-rgraph(10,5)		#Produce some random graphs

dim(g)			#Get the dimensions of g

g<-add.isolates(g,2)	#Add 2 isolates to each graph in g

dim(g)			#Now examine g
g